Lock.



H. V; P. COOKE.

LOCK.

APPLICATION FILED DEO.13, 1909.

Patented; Apr. 5, 191i).

narran lilllilltll.

LOCK.

Specification of Letters Patent.

Patented Espia 5, i916.

Application filed December 13, 1969. Serial No. 532,815.

To all whom it may concern:

Be it known that l, Hnnnr V. l?. (leona, a citizen of the United States, residing` at St. Louis, Missouri, have invented a certain new and useful improvement in Locks, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same, reference being,` had to the accompanying drawings, formingpart of this specilication, in which- Figures l, 2 and 3 are plan views of my improved lock, the top cover portion of the casing being removed. to more clearly show the interior. Fig. is a detail view of the key-post and cylinder. Figs. 4, 41A and 4B are detail views of several keys used in connection with my improved lock. Fig. 5 is a modified form of obstruction-tumbler.

AThis invention relates to a new and useful improvement in locks specially designed for use in connection with safe deposit boxes, although, of course, the locks may be used for any purpose.

In U. S. Patent No. 536,510, granted to me March 26, 1895, there is illustrated a lock, upon which my present invention is an improvement. In the lock of my aforesaid patent, there is an obstruction tumbler which normally is in position across the key-way of the regular key. Upon the insertion of a pass-key, this obstructioirtumblcr may be operated not only to open the key-way of the regular key, but also to permit the withdrawal of the locking;` bolt.

ln practice it was found that the attend ants in safe deposit vaults would sometimes throw the obstruction-tumbler of the wrong` lock. For instance, a person renting box 2l would seek to gain access to box 21, and the attendant would inadvertently throw the obstruction-tumbler in box 22. rlhen the attendant would, of course, throw the obstruction-tumbler in box 2l, and the renter of box 21 could insert th-e regular key and open box 2l. Box 22, however, would have the obstruction tumbler thrown, and there is no way in my aforesaid patent of resetting the obstruction tumbler except by the use of the regular key. In the case under consideration, the renter of box 22, being the only person holding a key which would operate the lock of that box, is the only person who can reset the obstruction tumbler. lt has been the custom therefore, under such circumstances where the obstruction tumbler had been inadvertently thrown by the attendant, to keep a record of all such box numbers, so as to inform the renters thereof, when the attendant with the pass-key was called upon to throw the obstruction tumbler, that the obstruction tumbler had been inadvertently thrown.

My present invention contemplates the use of three keys; one, a pass-key to set the obstruction tumbler, to open up the key-way for the regular key and permit the operation of the bolt, as in my aforesaid patent; another key, the regular key, to operate the tuinblers and throw the bolt, as in my aforesaid patent; and the third or other key identified with my present invention, which for all practical purposes may be a blank or straight-edged key, whose sole function is to reset the obstruction tumbler independently of the regular key and without throwing the bolt.

In the drawings, A indicates a suitable casing; B, the lock-bolt operating` therein, said lock-bolt being provided with a projection or fence C, which cooperates with suitable recesses in tumblers D.

E indicates the key-post, of ordinary construction, except that at the upper part of its reduced spindle it is recessed at c, to atl ford a seat. for the obstructimi tumbler, herein a fter described.

F indicates the removable portion of the casing, and G, a nose of the cylinder formed thereon, which cylinder is provided with two grooves, l and 2, to cooperate with the groove in the key-post` to forni key-ways for the pass-key and other keys.

Loosely mounted through the medium of a slot 3 upon the pivot Lrlof the regular tumblers, is an obstrnotion-tumbler .3, which is recessed at its for fard end, as at G, which recess cooperates with the projection C on the lock-bolt.

7 indicates a lateral projection formed on the forward end of the tumbler 5, which, in the normal position of the tumbler, is adapted to extend over and cover the regular keyhole, and which projection also forms a friction face 8. ln the normal position of the lock, this obstruction-tumbler is in the position shown in Fig. l, that is, the projection 7 covers the regular key-way and the friction face 8 in the recess c (see Fig 3^) permits the pass-key to be inserted in the keypost and groove 2 until said pass-kcy is seated. This will raise the tumbler to a position where its recess 6 is in alinement with the projection or fence C on the bolt. Upon turning the pass-key to the left, tumbler 5 is moved to the left, through the inedinm of the pass-key operating upon friction face 8. This movement to the left is permitted by slot, 3, allowing a play between the tumbler and the pivot-post The tumbler being thus moved to the left, the recess o will include the projection or fence C in its patli and, upon the removal of the pass key, the tumbler is held in an elevated position, or a position in which the projection 7 uncovers the regular key-way and permits the insertion of the regular key. (See Fig. The regular key can now be inserted to operate upon the tumblers D, .so as to aline their recesses, with the projection or fence C, and, by continued movement of the regular key, the foot X on the key-post throws or retracts the lock-bolt B. During the retraction of the lock-bolt, the projection or fence C enters into the recesses in all the tumblers, and, as the tumbler o was thrown forward, in advance of its normal position, the projection or fence C will come in contact with the bottom of the recess and force said tumbler o rearwardly. lVhen the lockbolt B is again thrown out, projection or fence C will leave the recesses in the several tumblers, and the obstruction-tumbler will be ready, through the medium of the spring 9, to again assume its position of obstruction to the passage of the regular key. After the bolt B has been once thrown, and the projection 7 is impinging againstthe regular key, as would be the case before the withdrawal of said key, the bolt cannot again be withdrawn because the recess G is not in alinement with the projection or fence C, and will not be in alinement with said projection until and operated as before described, thus making it absolutely necessary for the person carrying the pass-key to be present to unbolt a door upon which this lock may be applied before said lock can be operated to open the door after its bolt has been once thrown.

The above described parts are similar to those illustrated in my patent aforesaid.

My present improvement consists in cutting away the forward part of the projection 7 so as to form a shoulder 10. This shoulder l0, when the obstruction-tumbler is in the position shown in Fig. 3, occupies such relation to the key-way for the regular key, that, when a blank key, that is, a key with a straight edge or a key with arbitrary working faces, such as shown in Fig. dB, is inserted'in the regular key-way opening and turned to the right, said key will engage the shoulder 10 and reset the obstruction-tunibler without properly alining the other tumblers to throw the bolt. This obstructhe pass-key is vaga-.in inserted tion-tumbler key can now be removed, and the obstruetion-tunibler will immediately resume its position across the key-way for the regular key.

From the above it will be seen that. if the obstruction-tuinbler is inadvertently thrown, the attendant having possession of a straight edged or blank key, that is, a key which will not throw the bolt, can insert said key in the key-way for the regular key and turn the same just as the regular key would be turned, with the result that the obstructiontumbler will be reset so that it may, upon the removal of said blank key, occupy its normal position, to prevent the retraction of the bolt and at the same time prevent the insertion of a key in the regular key-way.

Tn Fig. 5, l have shown a modied form of obstruction-tinnbler in which there is a shoulder l1 arranged in front of the shoulder l() so as to form a notch in which the obstruetion-tumbler key operates. By this ccaistruction, when the obstruction-tumbler key .is inserted in position to reset the obstraction-tumbler, it is necessary to continue movement thereof until the rey registers with the groove or way for the pass-key when the obstruction-tumbler key may be removed. Should it be attempted to reverse the movement of the obstruct-ion-tumbler key for the purpose of withdrawing it through the key-way for the regular key, the shoulder 10 would cause the obstruction-tumbler to be positioned the same as when operated by the pass-key, as shown in Fig. 2. IThe insertion of the obstruction-tumbler key in the key-way for the regular key, and the withdrawal of said key through the keyway for the pass-key, necessitates a definite movement of said key, and insures the proper throwing of the obstruction-tumbler.

Having thus described my invention, what- T claim is:

l. 1n a lock, the combination of a casing, a sliding bolt, and tumblers cooperating with said bolt, a key-post having a single groove, a cylinder in which said post is mounted, said cylinder having a plurality of grooves, an obstrnotion-tumbler having a friction face and a shoulder, said obstruction-tumbler normally obstructing the key-way for the regular key, a pass-key cooperating with said friction face to set said obstructiontumbler so to open up the key-way for the regular key and to permit the retraction of the bolt, a regular key for cooperating with the tumblers to throw the bolt, said regular key also resetting the obstraction-tumbler so that when said regular key is withdrawn said obstruction-tumbler will again obstruct the key-way thereof and also prevent the retraction of the locking bolt, and another key which is incapable of properly positioning the tumblers to retract the bolt, but which is capable of cooperating with the shoulder on said bolt, n, key-post having a single groove, f

a. cylinder in which Said post is inounted, said cylinder lnrving grooves ior the pusskey und regular key respectively, an obstruction-tumbler having tivo shoulders, said obstruetion-tun1bler nornm-lly obstructing the key-Way for the regular key, a. pass-keyh pass-key groove i which is introduced into the when the Cylinder is properly positioned, for

Cooperating with said obstruCtion-tuinbler so as to open up the regular key-Way, said pusskey being withdrawn through the groove for the regular key, u regular key which is introduced into its groove for cooperating with the tinnblers to Withdraw the bolt7 said regular key being so constructed that it cannot be Withdrawn through the pass-key groove, Said regular key resetting the ob- Withdrawn strnotion-tumbler when it is through the regular key-Way groove, und t key :tor operating the obstrllotion-tumbler I post-groove to i'orin key-Way for i keyonly, Said key being ineerted inte' the key-v way for the regular key und being Wit-l s drawn through the key-way for the pusskey.

In a lock, the combination with the easing, bolt, tlunblers und key-post; Li Cylinderl in which said post operates, said cylinder lnuing a. plurality of keys; an obetruotion-tulnbler which norinully closes the key-wry for the regular key; a pass-key .tor operating said obstruction tumbler to open up the regular keyway; n regular key for operating the bolt when the obstruction-tumbler is withdrawn; and another key, which is incapable oit throwing the bolt, for operating the obstruction-tumbler so that it Will again close the "uy for the regular key.

In testimony whereof I hereunto :rilix my signature in the presence of two witnesses, this 10th duy ot' December, 1909.

HENRY V. P. COOKE.

Vitnesses F. Connu/ALL, M. P. SMTTH.

grooves for Cooperating with the 

